Experimental study of Gamow-Teller transitions via the high-energy-resolution O 18 (He 3,t) F 18 reaction: Identification of the low-energy "super"-Gamow-Teller state

H. Fujita, Y. Fujita, Y. Utsuno, K. Yoshida, T. Adachi, A. Algora, M. Csatlós, J. M. Deaven, E. Estevez-Aguado, C. J. Guess, J. Gulyás, K. Hatanaka, K. Hirota, R. Hutton, D. Ishikawa, A. Krasznahorkay, H. Matsubara, F. Molina, H. Okamura, H. J. OngG. Perdikakis, B. Rubio, C. Scholl, Y. Shimbara, G. Süsoy, T. Suzuki, A. Tamii, J. H. Thies, R. G.T. Zegers, J. Zenihiro

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Using the high-resolution O18(He3,t)F18 reaction at 0 and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to Ex=12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0. The B(GT) value obtained from the β decay of F18 (g.s.) →O18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F18. The obtained B(GT) values were compared with those from the O18(p,n)F18 reaction and the mirror symmetric β+ decay of Ne18→F18. The candidates for 1+ states with isospin T=1 were identified by comparison with the O18(p,p′) data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F18 ground state, suggesting that this state is the low-energy super GT state.

本文言語English
論文番号034618
ジャーナルPhysical Review C
100
3
DOI
出版ステータスPublished - 26-09-2019
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

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